JP2000018756A - Absorption heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the temperature of cooling water being used for hot water supply and floor heating by arranging a heat exchanger for exchanging heat with third heat carrier of higher temperature than first heat carrier in a duct passing the first heat carrier and employing an alcohol based fluid as refrigerant. SOLUTION: 2,2,2,-Trifluoroethanol having boiling point of about 74.5 deg.C is used as refrigerant and N-methyl-2-pyrrolidone having boiling point of about 204 deg.C is used as absorption liquid. A heat exchanger 41 and a cooling water tank 42 are arranged in series in a cooling water pipe 30 and cooling water flowing out from a condenser 3 while robbing heat from refrigerant vapor A exchanges heat with high temperature combustion exhaust gas G being fed from the burner 7 of a regenerator 8 through an exhaust pipe 43 and enters into the cooling water tank 42. Consequently, when an indoor unit is disposed at the part of the cooling water tank 42, interior of an absorber 5 and the condenser 3 is cooled and cooling water E having elevated temperature further exchanges heat with high temperature combustion exhaust gas G being fed from the burner 7 of the heat exchanger 41 before being circulated while being heated at about 80 deg.C or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump device used for a heating / cooling machine, a water heater and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of absorption heat pump device, for example, one having a structure shown in FIG. 2 has been proposed.

In FIG. 2, an absorption heat pump apparatus denoted by reference numeral 1X heats an absorption liquid C containing a refrigerant A for heat exchange and vaporizes the refrigerant A from the absorption liquid C to form a refrigerant A and an absorption liquid B A condenser 3 for condensing and liquefying the refrigerant vapor A supplied from the rectifier 2, and the refrigerant liquid A supplied from the condenser 3 is supplied to the inside. At the same time, an appropriate heat medium that is forcibly brought into contact with the outer surface, for example, an evaporator 4 that removes latent heat of evaporation from the outside air D to vaporize the refrigerant liquid A, and a refrigerant vapor A supplied from the evaporator 4,
Reactor 2 absorbs refrigerant A by reacting with absorbent B supplied from rectifier 2 to produce absorbent C containing refrigerant A, and circulates absorbent C to rectifier 2. And an absorber 5 to be used.

[0004] The rectifier 2 is an upright cylindrical rectification tower 6.
And a regenerator 8 provided below the rectification tower 6 and provided with a burner 7 for heating the absorbing liquid C containing the refrigerant A and functioning as a heating unit. Refrigerant liquid spraying means 9A for spraying the refrigerant liquid A into the rectification tower 6.
And an absorbent dispersing means 9B for dispersing the absorbing liquid C in the rectification tower 6, and a refrigerant liquid dispersing means 9A and a regenerator 8 interposed therebetween. The condenser 3 is provided with a refrigerant liquid tank 11 for storing the condensed refrigerant A and a refrigerant liquid spraying means 9A.

[0005] The evaporator 4 is composed of a plurality of heat transfer tubes 12 erected.
An upper header 13 for connecting the upper ends of the heat transfer tubes 12 to each other, a lower header 14 for connecting the lower ends of the heat transfer tubes 12 to each other, and a lengthwise direction of the heat transfer tubes 12. A large number of heat transfer fins 15 are provided at intervals and the heat transfer tubes 12 are fixed in a penetrating state.
Further, the refrigerant liquid tank 11 communicates with the upper end of each heat transfer tube 12 via the refrigerant liquid supply pipe 16, and the upper header 13 communicates with the upper part of the absorber 5 via the communication pipe 17. Further, the lower header 14 communicates with the absorbent tank 19 provided at the lower end of the absorber 5 via the communication pipe 18.

On the other hand, the absorber 5 has an absorbing droplet lowering means 20 to which a communicating pipe 17 connected to the upper header 13 of the evaporator 4 is connected, and an interval below the absorbing droplet lowering means 20. A plurality of heat transfer tubes disposed therein for storing the absorbing liquid B that has absorbed the refrigerant by reacting with the refrigerant vapor A, that is, the absorbing liquid C, and a plurality of heat transfer tubes communicating the absorbing liquid dropping means 20 with the absorbing liquid tank 19; And an exterior body 2 provided around the heat transfer tubes 21 and forming a cooling water flow path 22 between the absorbing liquid dropping means 20 and the absorbing liquid tank 19.
The evaporator 4 is configured to suck the vaporized refrigerant A in the heat transfer tube 12 of the evaporator 4 by lowering its internal pressure.

[0007] Absorbing liquid dropping means 20 is connected to an absorbing liquid supply pipe 24 for supplying the absorbing liquid B concentrated in the regenerator 8 at an upper portion thereof. A dispersing plate 25 arranged so as to be divided is mounted, a heat transfer tube 21 is fixed below the dispersing plate 25, and the absorbing droplet lowering means 20 and the cooling water flow path 22 are separated from each other. A communication pipe 17 is connected between the partition 26 and the dispersion plate 25, and the vaporized refrigerant A is sent from the evaporator 4 through the communication pipe 17.

Further, the absorbing liquid tank 19 communicates with the absorbing liquid dispersing means 9B of the rectifier 2 through an absorbing liquid returning pipe 27. Liquid dispersing means 9B for absorbing liquid C stored in
An absorption liquid circulating pump 28 is provided for feeding the liquid to the pump.

The upper end of the outer package 23 of the absorber 5 and the condenser 3
A cooling water pipe 29 is provided between the condenser 3 and the lower end of the exterior body 23 of the absorber 5 to provide communication between them. The outer body 23, the cooling water pipe 29,
A closed circuit for cooling water circulation is formed by the condenser 3 and the cooling water pipe 30, and an indoor unit 31 for heating and a cooling water circulation pump 32 for circulating the cooling water E are provided in the middle of the cooling water pipe 30. Is provided.

Reference numeral 33 denotes a heat exchanger for exchanging heat between the absorption liquids flowing through the absorption liquid supply pipe 24 and the absorption liquid return pipe 27, respectively, and reference numeral 34 denotes an evaporator 4.
Shows a blower fan for supplying outside air D to
Reference numeral 35 denotes a heat exchanger that exchanges heat between the cooling water E supplied to the absorber 5 and the absorbing liquid B supplied to the absorbing liquid dropping means 20.

In the absorption heat pump apparatus 1X constructed as described above, a part of the refrigerant liquid liquefied in the condenser 3 is returned to the upper part of the rectification tower 6 from the refrigerant liquid spraying means 9A, and most of the refrigerant liquid is stored in the refrigerant liquid tank 11 Enter and accumulate. The refrigerant liquid A sprayed and returned from the refrigerant liquid spraying means 9A to the rectification tower 6 is re-evaporated here, and the ratio of the refrigerant vapor A contained in the vapor entering the condenser 3 is increased. I have.

On the other hand, the refrigerant liquid A stored in the refrigerant liquid tank 11
Is supplied to each heat transfer tube 12 via the refrigerant liquid supply tube 16 and flows down along each inner wall surface. At this time, the outside air D supplied by the blower fan 34 to the heat transfer fins 15 and the surface of the heat transfer tube 12 Since it is in contact, heat exchange is performed between the outside air D and the refrigerant liquid A flowing down the inner wall surface of the heat transfer tube 12, and the refrigerant liquid A deprives the outside air D of vaporizing latent heat and evaporates. The refrigerant vapor A thus generated moves upward in each heat transfer tube 12, is collected by the upper header 13 provided at the upper end of the heat transfer tube 12, and flows into the absorber 5.

The refrigerant vapor A flowing into the absorber 5 comes into contact with the absorption liquid B supplied from the regenerator 8 and is absorbed by the absorption liquid B. Is collected in the absorption liquid tank 19, and the absorption liquid C
Is transported to the rectifier 2 by the absorbent circulation pump 28,
It is sprayed into the rectification tower 6 from the absorbing liquid spraying means 9B.

The absorbing liquid C sent to the rectification tower 6 is heated by the combustion heat generated by the burner 7 while flowing down through the space between the fillers 10 to vaporize and separate the absorbed refrigerant A. Absorbent B accumulates in regenerator 8.

The refrigerant vapor A separated and generated in the rectifier 2 exchanges heat with the cooling water E when passing through the condenser 3 and radiates heat to the cooling water E. When passing through the absorber 5, When the refrigerant A evaporates, the heat absorbed from the outside air D is transferred to the cooling water E.

That is, the cooling water E is supplied to the absorber 5 and
It is gradually heated while circulating to the condenser 3 and then sent to the indoor unit 31 for heating.

In such an absorption heat pump device 1X, the heat energy of the outside air D is absorbed to assist the heating of the cooling water E, and the amount of heat radiation from the indoor unit 31 with respect to the amount of heat generated by the burner 7 is reduced. 1.3 times or more can be achieved.

[0018]

However, in the absorption heat pump apparatus having the above-mentioned structure, the condensing temperature is, for example, about 50 to 60 ° C., -20 to -10, so as not to be restricted by the High Pressure Gas Control Law. 2,2,2-trifluoroethanol (hereinafter referred to as T)
FE) or the like as a refrigerant, and N-methyl-
When 2-pyrrolidone (hereinafter referred to as NMP) or the like is used, heat is taken from the refrigerant vapor in the condenser to liquefy the refrigerant, and the temperature of the cooling water whose temperature has been raised is limited to 50 to 70 ° C. Because it was difficult to use for floor heating and floor heating, it was necessary to raise the temperature so that it could be used for hot water supply and floor heating, and this was a problem to be solved.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, the present invention provides a rectifier provided with a heating unit for heating an absorbing liquid to vaporize and separate a refrigerant contained in the absorbing liquid,
A condenser that liquefies the refrigerant vapor supplied from the rectifier by exchanging heat with the first heat medium, and an evaporation that vaporizes the refrigerant liquid supplied from the condenser by exchanging heat with the second heat medium. And reacts the refrigerant vapor supplied from the evaporator with the absorbing liquid supplied from the rectifier to absorb the refrigerant into the absorbing liquid, and returns the absorbing liquid having absorbed the refrigerant to the rectifier. And a third heat medium having a higher temperature than the first heat medium is supplied to a pipe through which the first heat medium, which liquefies the refrigerant by removing heat from the refrigerant vapor in the condenser, is provided. A heat exchanger for exchanging heat with an absorption heat pump device of the first configuration, wherein an alcohol-based fluid is used as a refrigerant;

[0020] In the absorption heat pump device of the first configuration, a heat exchanger for exchanging heat between the first heat medium and the third heat medium is provided in a heating section of the rectifier to remove the absorbing liquid. 3
A heat exchanger used as a heat medium, or a combustion exhaust gas which is installed outside the rectifier and discharged from a heating unit of the rectifier,
The second heat exchanger used as the heat medium
And an absorption heat pump device having the above configuration.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. For easy understanding, the same reference numerals in FIG. 1 denote portions having the same functions as those described in FIG.

The absorption heat pump apparatus 1 of the present invention has a fluid whose boiling point is much lower than that of water used as a refrigerant when an aqueous solution of lithium bromide is used as an absorbing liquid, for example, has a boiling point of 7.
In this method, 4.5 ° C. TFE or the like is used as a refrigerant, and NMP or the like having a boiling point of 204 ° C. is used as an absorbing liquid.

In the absorption heat pump apparatus 1 in this case, a heat exchanger 41 and a cooling water tank 42 are installed in series in the cooling water pipe 30, and the condenser 3 takes heat from the refrigerant vapor A and flows out. The cooling water E is configured to enter the cooling water tank 42 after exchanging heat with the high-temperature combustion exhaust gas G sent out from the burner 7 of the regenerator 8 and sent through the exhaust pipe 43.

In this case, the absorption heat pump device 1 is of a type in which the evaporator 4 has a large number of built-in heat transfer tubes 12, and the water F stored in the cold water tank 44 inside these heat transfer tubes 12 is On the way, chilled water circulation pump 45 and on-off valve 4
6 can be circulated and supplied through a cold water pipe 47 having

On the other hand, a refrigerant liquid dispersing means 48 is provided on the upper inside of the evaporator 4, and the refrigerant liquid A condensed by the condenser 3 and stored in the refrigerant liquid tank 11 can be supplied to the refrigerant liquid dispersing means 48. As described above, the refrigerant liquid supply pipe 16 having the on-off valve 49 is connected to the upstream portion, and the water F flowing through the pipe when the refrigerant liquid A sprayed from the refrigerant liquid spraying means 48 flows down the outer surface of the heat transfer pipe 12. It is configured to take heat from and evaporate.

Further, the bottom of the condenser 3 and the refrigerant liquid spraying means 9A
An on-off valve 51 is installed in the refrigerant liquid return pipe 50 connecting the two.

In the absorption heat pump apparatus 1 having the above structure, for example, if the indoor unit 31 shown in FIG. 2 is installed in the portion of the cooling water tank 42, the inside of the absorber 5 and the condenser 3 is cooled, and The high-temperature cooling water E is further discharged from the burner 7 in the heat exchanger 41 and the high-temperature combustion exhaust gas G
As a result, the indoor unit 31 is heated and heated to 80 ° C. or higher and circulated and supplied. Further, even if floor heating or a hot water supply load is installed in the portion of the cooling water tank 42, sufficient heat can be supplied.

On the other hand, if the indoor unit 31 shown in FIG.
Is vaporized to radiate heat, and the water F whose temperature is lowered is circulated and supplied to the indoor unit 31 via the cold water pipe 47, so that the indoor unit 31 performs a cooling action. In this case,
High-temperature combustion exhaust gas G emitted from the burner 7 to the heat exchanger 41
Is preferably not supplied.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the heat exchanger 4 provided in the cooling water pipe 30
1 is installed inside the regenerator 8, the cooling water E flowing inside the cooling water pipe 30, and the regenerator 8 heated by the burner 7.
May be configured to exchange heat with the absorbing liquid B therein.

The filler 10 to be filled into the rectification tower 6 may be a stainless steel wire mesh or a thin wire rod.

Further, in the absorption type heat pump apparatus 1 of the present invention, a fluorinated alcohol-based fluid having a boiling point of 120 ° C. or less can be used as a refrigerant, and ethers, esters, polyols, amides, amines Kind,
Imides, ketones, aldehydes, nitriles and the like can be used.

[0033]

As described above, according to the present invention, for example, a condensation temperature of about 50 to 60 ° C. and an evaporation temperature of about -20 to -10 ° C. so as not to be restricted by the High Pressure Gas Control Law. In an absorption heat pump device used for an alcohol-based refrigerant such as TFE that can be operated at a temperature of 80 ° C.
Since heating can be performed as described above, it can be used not only for heating but also for hot water supply and floor heating.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1.1X Absorption type heat pump apparatus 2 Rectifier 3 Condenser 4 Evaporator 5 Absorber 6 Rectification tower 7 Burner 8 Regenerator 9A Refrigerant liquid spraying means 9B Absorbent liquid dispersing means 10 Filler 11 Refrigerant liquid tank 12 Heat transfer pipe 13 Upper header 14 Lower header 15 Heat transfer fin 16 Refrigerant liquid supply pipe 17/18 Communication pipe 19 Absorbing liquid tank 20 Absorbing liquid dropping means 21 Heat transfer pipe 22 Cooling water passage 23 Exterior body 24 Absorbing liquid supply pipe 25 Dispersion plate 26 Partition 27 Absorption Liquid return pipe 28 Absorbent liquid circulation pump 29/30 Cooling water pipe 31 Indoor unit 32 Cooling water circulation pump 33 Heat exchanger 34 Blower fan 35 Heat exchanger 41 Heat exchanger 42 Cooling water tank 43 Exhaust pipe 44 Cold water tank 45 Cold water circulation pump 46 On-off valve 47 Chilled water pipe 48 Refrigerant liquid spraying means 49 On-off valve 50 Refrigerant liquid return pipe 51 On-off valve

Continued on the front page (72) Inventor Toshio Kubo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3L093 AA05 BB01 BB22 BB29 BB43 LL01 MM06

Claims (2)

[Claims] 1. A rectifier provided with a heating unit for heating an absorption liquid to vaporize and separate a refrigerant contained in the absorption liquid, and a refrigerant vapor supplied from the rectifier to a first heat medium. A condenser that liquefies by exchanging heat, an evaporator that evaporates by exchanging the refrigerant liquid supplied from this condenser with the second heat medium, and a refrigerant vapor and rectifier that are supplied from this evaporator In the absorption heat pump device including a reaction between the supplied absorbing liquid and the absorbing liquid to absorb the refrigerant, and an absorbing liquid that returns the absorbing liquid having absorbed the refrigerant to the rectifier, the condenser heats the refrigerant from the refrigerant vapor. A heat exchanger for exchanging heat with a third heat medium having a higher temperature than the first heat medium is provided in a conduit through which the first heat medium, which has taken heat and liquefied the refrigerant, is provided. An absorption type heat pump device characterized by using: 2. The absorption heat pump device according to claim 1, wherein a heat exchanger for exchanging heat between the first heat medium and the third heat medium is provided in a heating section of the rectifier to remove the absorbing liquid. Third
A heat exchanger used as a heat medium, or a combustion exhaust gas which is installed outside the rectifier and discharged from a heating unit of the rectifier,
An absorption heat pump device, which is any one of the heat exchangers using the heat medium of (1).